Look at the different search engines (sources) that drive traffic to your site to determine where you want to invest your resources. For example, if you're getting an overwhelming amount of visitors and revenue from a particular search engine, that's an obvious source of profitable traffic and an area in which you might want to make further investment; but you might also find another search engine that delivers only a few visitors, but ones who represent a very high Per Visit Value. In this latter case, you might want to increase your spend in that area to drive more of those high-value visitors to your site.
One of the things that can slow-bleed the traffic from your site is the quality (or lack thereof) of the content you publish on your site. Previous Google updates like Panda have already been released specifically to deal with the issue of low-quality content on websites. Long story short: Panda intended to stop sites with bad content from appearing in the search results.
While there are several HTML tagging techniques that improve a page’s Google SEO results, creating relevant page content is still the best way to rank high. A big part of content creation is your use of targeted keywords. You should include important keywords in your first 50 words, since early placement can be a signal of relevance. And while you should never repeat keywords too often at the expense of good writing, you should repeat keywords in your content two or three times for short pages and four to six times for longer pages. Also, you may wish to use some keyword variation in your content  such as splitting keywords up  as this could potentially improve your ranking.
One important thing to note is a website’s domain authority (DA) and page authority (PA). This is a number from 1 to 100 that indicates the strength of a website’s domain or a specific page. DA and PA are two of several factors that go into how a website will be ranked on a SERP. The higher the DA and PA, the better the chances are of that webpage ranking on the front page of a SERP (everyone’s dream!). This number is determined by a few things, such as the age of the website and number of links leading to it (backlinks).
I agree with the point that a small or medium-sized business will have limits for budget and resources in generating brand search, but I wouldn't say that stops them from potentially producing huge growth there if they do something interesting/innovative etc. I can think of quite a few small to medium sized brands that have more name recognition than larger companies in their space. The challenge is that many of those brands are led by people who are very good at generating marketing and publicity - it's harder for small brands to be able to afford to pay for a top level consultant or agency.

BrightEdge is the only technology that allows marketers to get an accurate understanding of how organic search rankings are tied to business value. It allows customers to track actual placement among all types of search results. BrightEdge users can switch data and reports between blended and classic rank results to gain more visibility and insight into the effects of local, images, videos, and more. You can also see how your content is performing across device types, like mobile, and in different regions within the same country. The image below from BrightEdge StoryBuilder shows Classic Rank in blue and significantly different rank for Blended or Universal results, which include universal rank types such as quick answers, images, videos, and shopping.

Search engine optimization (SEO) is the process of affecting the online visibility of a website or a web page in a web search engine's unpaid results—often referred to as "natural", "organic", or "earned" results. In general, the earlier (or higher ranked on the search results page), and more frequently a website appears in the search results list, the more visitors it will receive from the search engine's users; these visitors can then be converted into customers.[1] SEO may target different kinds of search, including image search, video search, academic search,[2] news search, and industry-specific vertical search engines. SEO differs from local search engine optimization in that the latter is focused on optimizing a business' online presence so that its web pages will be displayed by search engines when a user enters a local search for its products or services. The former instead is more focused on national or international searches.

Google's search engine marketing is one of the western world's marketing leaders, while its search engine marketing is its biggest source of profit.[17] Google's search engine providers are clearly ahead of the Yahoo and Bing network. The display of unknown search results is free, while advertisers are willing to pay for each click of the ad in the sponsored search results.
The HTML tag is meant to be a concise explanation of a web page’s content. Google displays your meta description beneath the page title in their organic results. While meta descriptions aren’t as important as page titles in your Google ranking, they do play a big role in getting clicks from users. People read descriptions as a preview of your page and use it to determine if your content is worth visiting. You should keep your meta descriptions to under 150 characters since Google won’t display text beyond that. You should also include target keywords in your text, since any words matching a user’s search query will be displayed in bold.
Remember when you used to rely solely on search engines for traffic? Remember when you worked on SEO and lived and died by your placement in Google? Were you #1? Assured success. Well, okay, maybe not assured. Success only came if the keywords were relevant to your site users, but it was the only real roadmap to generating site traffic and revenue.